VB获取执行程序图标
一个CommonDialog，一个CommandButton，一个PictureBOX
Option Explicit
Private Declare Function DrawIcon Lib "user32" (ByVal hdc As Long, ByVal x As Long, ByVal y As Long, ByVal hIcon As Long) As Long
Private Declare Function ExtractIcon Lib "shell32.dll" Alias "ExtractIconA" (ByVal hInst As Long, ByVal lpszExeFileName As String, ByVal nIconIndex As Long) As Long
Private Sub Command1_Click()
Dim total As Long
Dim p(50) As Long
Dim i As Integer
Me.Picture1.Cls
Me.CommonDialog1.Filter = "图标|*.Exe;*.Ico;*.Dll"
Me.CommonDialog1.ShowOpen
If Dir(Me.CommonDialog1.FileName) <> "" Then
If ExtractIcon(App.hInstance, Me.CommonDialog1.FileName, -1) = 0 Then '如果没有图标
MsgBox "No Icon!"
Else
total = ExtractIcon(App.hInstance, Me.CommonDialog1.FileName, -1)
'取得总图标数
For i = 0 To total - 1
p(i) = ExtractIcon(App.hInstance, Me.CommonDialog1.FileName, i) '读取每个图标
Next i
For i = 0 To total - 1 '依次显示每个图标
DrawIcon Picture1.hdc, 34 * i, 0, p(i)
Next i
End If
End If
End Sub
相关文档：
VERSION 5.00
Begin VB.Form Form2
AutoRedraw = -1 'True
Caption = "计算界面"
ClientHeight = 4905
ClientLe ......
mxl=1 && 最大的文本框编号
mnl=1 &n ......
VB6
在程序运行时用如下语句：
if app.PrevInstance=true then
end
end if
VB 2005:
1. 在VB2005中,打开"属性"页,启用"应用程序“框架, 选中"
单实例应用程序"前面复选框,就行了。
......
Option Explicit
Private Const NCBASTAT = &H33
Private Const NCBNAMSZ = 16
Private Const HEAP_ZERO_MEMORY = &H8
Private Const HEAP_GENERATE_EXCEPTIONS = &H4
Private Const NCBRESET = &H32
Private Type NCB
ncb_command As Byte
ncb_retcode As Byte
ncb_lsn As Byte
ncb_num As Byte ......
MSComm控件提供了两种处理通信的方式：一种为事件驱动方式，该方式相当于一般程序设计中的中断方式。当串口发生事件或错误时，MSComm控件会产生OnComm事件，用户程序可以捕获该事件进行相应处理。本文的两个例子均采用该方式。另一种为查询方式，在用户程序中设计定时或不定时查询 MSComm控件的某些属性是否发生变化，从而� ......
